Home / 21,161.27-29,215.85-13,620.71

Finding the Fourth Proportional to 21,161.27, 29,215.85 and 13,620.71

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Solution

The fourth proportional to 21,161.27, 29,215.85 and 13,620.71 is: 18,805.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,161.27 : 29,215.85 = 13,620.71 : x
  2. Step 2: Convert to fraction form
    21,161.27/29,215.85 = 13,620.71/x
  3. Step 3: Cross multiply
    21,161.27x = 29,215.85 × 13,620.71
  4. Step 4: Simplify right side
    21,161.27x = 397,940,625.19
  5. Step 5: Solve for x
    x = 397,940,625.19/21,161.27
  6. Step 6: Final answer
    x = 18,805.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.